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Commit a5bbf6fa authored by Kim Phillips's avatar Kim Phillips Committed by Herbert Xu
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crypto: caam - increase TRNG clocks per sample 



we need to configure the TRNG to use more clocks per sample
to handle the two back-to-back 64KiB random descriptor requests
on higher frequency P5040s.

Signed-off-by: default avatarKim Phillips <kim.phillips@freescale.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent b6f3fefe

drivers/crypto/caam/ctrl.c

+3 −3
Original line number Diff line number Diff line
@@ -129,7 +129,7 @@ static int instantiate_rng(struct device *jrdev) 


/*

 * By default, the TRNG runs for 200 clocks per sample;

 * 800 clocks per sample generates better entropy.

 * 1600 clocks per sample generates better entropy.

 */

static void kick_trng(struct platform_device *pdev)

{
@@ -144,9 +144,9 @@ static void kick_trng(struct platform_device *pdev) 


	/* put RNG4 into program mode */

	setbits32(&r4tst->rtmctl, RTMCTL_PRGM);

	/* 800 clocks per sample */

	/* 1600 clocks per sample */

	val = rd_reg32(&r4tst->rtsdctl);

	val = (val & ~RTSDCTL_ENT_DLY_MASK) | (800 << RTSDCTL_ENT_DLY_SHIFT);

	val = (val & ~RTSDCTL_ENT_DLY_MASK) | (1600 << RTSDCTL_ENT_DLY_SHIFT);

	wr_reg32(&r4tst->rtsdctl, val);

	/* min. freq. count */

	wr_reg32(&r4tst->rtfrqmin, 400);